I believe I’ve found (almost) immortality

You’ll need to play the warlock class & take the fiend patron (for Dark ones blessing which when you drop a creature’s hp to 0 you get temp hp equal to your charisma mod + you warlock level) what you need to do is go to any pet shop and buy live insects (or gather them yourself I just think this way is easier) and keep them in a small sack and 20 or 30 should do and before combat cast any AOE spell into the sack (poison spray will probably be your best choice) killing every bug in there and assuming you have at least a plus 3 in charisma and are like level 3 that would be 6 temp hp per bug X which assuming you have like 20 bugs that’s 120 temp hp at lvl 3

Edit: I would like to make to clear I wasn’t pointing this out because I was encouraging people to use it I was just pointing it out as a big flaw which after posting this I learned was already addressed